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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e67de751f360f9c2e897b94857697c4f5744cd9a19768c6e8f27ba2bf9a81604' 
  AND token = 't5ozFiFhDYKINhSachpVD5LDu+uiwT45B6rOAXEhs64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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