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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f620ecc7553dca864b618b2484c31a58c4861267a189c2d9e916f551e99cbee' 
  AND token = 'gKlw7LDbFY6qKAK6ful8sJhxwwAUYAP210rSwHtWXkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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