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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '479f4dd1ee8eeca0475ca9a17b8880bc804e5dad4b58bb67ee07ac5deac96d0f' 
  AND token = '6ED8OBqhKvee+kswuFwmPF+D+OgmXu4wwntbTKK4mCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00719

JSON explain

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