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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9bc0c68013cf5c44ecf51483e63c220abf79fa12cb00241d88aab8ddc23de32a' 
  AND token = 'KZ6Z7rH70zcDwaw8Gt0NMjx+C9zZyj0++bZeBkjV5yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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