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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63a27e4db3a5a7f599b867732931cd3c01ac0cbcc8c7059874a4b979b2cb780b' 
  AND token = '4pCQ80Cfr9DuMSWW78RXVfeBXlmFXBBvPnU/rfhQeUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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