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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76570b157488bcc415a88df35c6770893acaa60132c46f34806c449c654ed1b1' 
  AND token = 'BnE5vm9Uyb9Q8Lush3m1NlTtlu0Iv5F6uWB9f5QVC1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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