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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '500a7bd86db51caffb74606b3a0fec8fea19d991f6f166036dd8a9bb488f7604' 
  AND token = 'qDP38axDJTijOc6mex2RzeBOcGyffD+s57y6qtH9o6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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