SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83471bf670631628b3748ea348b2d8703546952d96eda526938f961e7e07c6cd' 
  AND token = '08Tu5jPmmKW3CYcVBDRpyXxH1OmpMFMGMCAxg5W+wM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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