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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f898f86e6235ab83e697b722e6fbe94decea89c522b9e3f50f61e346391e97e' 
  AND token = 'vecT7sQLyRdauE3MrCj+B8FQ4pqBjITcGuwnvGEnQ4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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