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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f6c38de83b93858e83cc93d06c070f8b7545195959d45705b33fec710f79baa' 
  AND token = 'sGSorJSJ4ejqGyiGOjYdM4LMWyTy92EA+goi68+D9S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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