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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d9249a77e7691fb657409efc2a53d4391cb42a85ebb87a5942254000179babc' 
  AND token = 'cWd3Kue762dPSJWeLIY63qyyoaNR1UwPPInScdYV958=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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