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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea5fb9fb942cda98f4a4c1ea182471bae15a15ca1fd67fea40ab86f9bd3318e1' 
  AND token = 'Y8LKM9cc+hw6WNO80DaW7hoqar8I9DYcC804uB/ZcKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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