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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd244773553fd1d6d7fab4e6bd362f1eb69d61ccfca078aa8b69ea9127255e724' 
  AND token = 'Mk9p0hvLQlXhfZAFIu5tb9dlmU5WzMY4SOHd+QLa8qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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