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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3773f6cc03ad3f782b7253b4d9304cdc20d2bcd09572db80e30ca9a40afffa01' 
  AND token = 'OZEUMP0cITR8fInX1vXjVlUF0AhhznKCUdxJgIASbcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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