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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af1096416291cb7fb1fb3b5cabb0a3c295efc8e22b36b462fac6fda3676f1ef5' 
  AND token = 'fkwdkVtLelfDnm4sABjq0MqawQ7ZIEgwjJimd/F5MXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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