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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be0cea4a5820cf99be5c40bb0c3dc4f4df62180a42acf4abe62c3e391ba49abf' 
  AND token = 'hVEWTZawrbkpwTWuYS5+tnEAHl8U9JLId8SnyFWkDB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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