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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '078886643bf868c1cdcc7bacd2c7063da4a7debc5ac8dd5db334950dd045c690' 
  AND token = 'k/sQAA0XC/uw5u6PCE4fHxhAE2doDwMq89dM4sbmk+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}