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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2487f3b950bcb3d96642b4a5d6695a7644ee15a3373259275934c74bda01d99' 
  AND token = 'TeAa6ltsn4kH8lv+8bR6Ym0o93Y1vFhwmuZJ2deZA/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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