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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09797115c85d99bab1a0cd9bec9baf24445e74be854e9bdb0f5862f32dbd138b' 
  AND token = 'A91W1TUMI0/FuYr2LgM/3tgKx66n4z6eAHkz/84QHAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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