SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f5c0c43a6ee9fb7513919a832ff3d0b97ed401bfb3dec375feeb73d2b9e7703' 
  AND token = 'rCvSv1vPYujjZCpFXnGTRVG0JGCSzY5VSm2J8EfdsnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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