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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1b3c4f736665a7c0b0400cf8778dd10104caf2e49d2c2bc2cfc6c8648ac77d2' 
  AND token = 'ICx6YTuMd49d1vC0Zn9rxldnObZ4mZ71udlls6388gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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