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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0faabfc94b7871b0951524c796e31f43b968184837113ecd54a886eaa8437029' 
  AND token = 'p1eUxdVgri6o+iXOgbJg0NflQyOMBxRUv1iEKZsml64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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