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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'defe2cf0d2f9c084f7ee8e1b0e71ef440edd8ae016182a2760716f4b00e1662d' 
  AND token = '8s/oUN+XPdYczDC5FIonoFHgEhZsWEUltcH4Tt1pqpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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