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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5361f406c4defc61a345dce5ead2cdbc7a7c5c1f46c7518c6a679b34d199fe2' 
  AND token = 'ewlu+I/NRrr5iVuV8UBt/aekM/J7cbhuOOshiLDl6pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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