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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b46190196f7b5595b5e3990827d6be6c4d13212a505ab490501d3b605a10086d' 
  AND token = 'd6r8WXE0mWXl0EZwYWAeC5kKiAwn9tVWZ/toaZRa650=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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