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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ab15546b90d213cceab15a54af0bbfdedb82bba725994af7e0866e12abf8357' 
  AND token = 'LINMjvtoy+DJyRhSc7Fwl75BdUB1LXZgO8d03mgby+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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