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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa67b1dfe0d67f6e8f087af1f283adb90329734ede966cca291e075449a8ee6f' 
  AND token = 't9oxroBlKfpoDmVv4vO2fIhIGUm8SlPC1mv+tiQye+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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