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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1592cd941596f54266bdf28fb10191e7e57c3c793d5677b7dd9d61dee12ad48f' 
  AND token = '8qLB6Eg9D+XrV4yskvYT1u0yk6sktept21fkRXYdCRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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