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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d70a8b47be92842880e3af74ea087e644354c29117d55faf4ebb66331dd1b4e' 
  AND token = '4abjtvhgtamgx+5mpoUWyUVCH1bDLTX6f4J5eAprc3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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