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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eeb9266103116b92c9c11742b6313d71f7214a4c23219d1f5bedf05f8658e207' 
  AND token = '8TtaoUkACi2HmhPRoi4FBsLLlIkII4ekJW0iZxU32WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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