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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ad494960dd01790103721fa2c865acf0c0e18aff41aa5dca3b12ae7d71ea45a' 
  AND token = 'CJIj5yjtQ09viqxaaLRtODSdvv+OPl4uKiEkCCi/zz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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