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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '031eec90b1b1d8be0a5cc29a65a391be4d7e07e738894f58ef5905117b0e10de' 
  AND token = 'U5UuH8MITrVHjyEFd/xR40i+kmDbKAJjPCqWXZFLpcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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