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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a000c39792543d2a3176a1dc82dde3db003bd45f8d909161d668fb7575d8b57' 
  AND token = 'm6cDoHFmSJ2xRrXcze79gn6ZORCOFebsf4ynI11k2cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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