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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c30070b2c9905e9be8e19c856488172b41d4282e41295035418ef45fc78202aa' 
  AND token = '4L1YTeTL8EW1ebVe2tFKjVObSfluI6tTwNh/b7AR4tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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