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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51879bc06c49368754c0b9b061e339f6963baf3f48c51a0d9e64df56ce1cc399' 
  AND token = 'GD4/oNo1Vx2qsuoliPZnOlN9uAnlJ1YTXNLIAwNLAiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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