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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e955ebf5687bc8541c5b8eb670227e10ed2c75f09ddc29543a2d5a174e75ad0' 
  AND token = 'YhEW1V00TdRPUDpLVYG8m69dl81LzK3NjE/MMiessRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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