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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1191681a6d9fc0512e238e409d7f6ff0ed9d04ddae690b57ca35a163bd60f7db' 
  AND token = 'UHM3lCveZ6s6AubBsE63kAHPKqFuitom1JIUcLUk93c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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