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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cb3d9fe9de5ea9e3470ee89d437146a077733ff84d391ce30768d7136409d3e' 
  AND token = '5iRbO/Ev+Y+trt3/+o2wGgnhbtR5+pCuTi6KJpiW5hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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