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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd49fd02e63343ad7c4ef78c9d339bd41e6a7b1af495a0c9313ddf43ff8465d4' 
  AND token = 'SOJqFhEqfAP83hWAR0hxmXpz3zq7v0pVOd7o44jSjtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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