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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbb02ec46507865751fcef9d2ad5562e52368ff360c638c5ca17914ee85f558d' 
  AND token = 'jBX4WfBolTvBXICLEqTY+TinUG97txcipkEMOmLqETM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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