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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97b9eca310d6ffe809c6ba7a547ef3f297c0c796c745ecc6dad931d5af599227' 
  AND token = 'JAlqvCebQN5Dm6kxFU3t4qs0LuAnNh38fLOokskRQPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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