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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4f355067049e7d312631756d542f178db1041541bc806703c95dc31d0894785' 
  AND token = '9r0v3do0rJgTz1/9S9RX8VXGpAn9+lIP4OMiq0YPObQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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