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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3b64ddbaf1e04e6e6660f95fbc2f0801b06061e9b8426f027dcb2cca83d09dd' 
  AND token = 'u3iB9KHB2fOvd7wr67t8vbOk1H9jwRK2st78H/FTpZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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