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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bea2f91d2a7ca8914acb283d1f1ecb5889b8d20cb33f439052a3bb317640bba' 
  AND token = 'czZ6hDxXtHrevs2jy8cjO7ZckgD1rF5ZZ3zzPw1Eizs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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