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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69a83ed882b4c37eddf8a9007ab23017d5171e429ea5e790b66f26633aafdbf7' 
  AND token = 'dZg/ZXGS4zbyysALbd8ugC+sz/Qymp0X4AS6Xbv45mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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