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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98c419e0d1e16fd602e086365efd68cfed92ee71420494f47f4085d9f01358c3' 
  AND token = 'O7D2NLMLxDIJRI6IMglZpECs5t/MBRWj6cuVuRyXcU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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