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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be959ee68178c5d7a6dbd5a6c95395ddee7b1fd5280362e533778fef3f97ac2f' 
  AND token = 'xv/dp02WEBWP4i96enSXDG33+hXVoRdfZA6MUwyAhL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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