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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9404924e18f18d71c006372558f1651d43bcb6993994e586f5a6b662c7e55f6' 
  AND token = 'cCu9yA9ZRNUj2FBOL/iR4o24e9jtjk8XjveNlRWDIzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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